A measuring device for multi-vane passage detection

Abstract

This invention discloses a measuring device for detecting multi-stage guide vane channels in aero-engines, comprising a base and positioning module, a measuring module, and a clamping module. The positioning module employs a 6-point positioning principle (6 fixed points + 1 movable point), using the fixed positioning module to limit the X / Y degrees of freedom of the blade and the movable positioning module to adjust the Z-axis tolerance. When the measuring module performs direct measurement, at the exhaust side, the measuring block is placed against a reference block, and a feeler gauge is used to measure the gap between the measuring pin and the part being measured, thus determining the position of the measuring point. When the measuring module performs indirect measurement, at the intake side, the measuring pin contacts the part being measured, and the tolerance value of the measuring point is determined by observing the gap between the measuring block and the reference block. This invention enables efficient and accurate detection of the position of measuring points in the multi-stage guide vane channels of low-pressure turbines in aero-engines within confined spaces, solving the problem that traditional measurement methods are not suitable for this type of blade structure.

Description

Technical Field

[0001] This invention relates to a measuring device for detecting multi-stage blade channels, belonging to the field of manufacturing technology for multi-stage guide vanes of low-pressure turbines in aero-engines. Background Technology

[0002] The multi-stage guide vanes of low-pressure turbines for aero-engines are precision-cast blades, characterized by high precision and high performance. Throughout the casting cycle, the casting profile of the blade channel must be strictly controlled. Therefore, it is necessary to strictly detect the position of the measuring points on the channel in order to detect problems in time and then repair the flow channel surface or adjust the position of the mold surface.

[0003] Since the positioning points of the multi-stage guide vanes of the low-pressure turbine of aero-engine are all located below the intake side, and the measurement points are located on both the intake and exhaust sides, the measurement of the measurement points of the multi-stage guide vane channel of the low-pressure turbine of aero-engine becomes a technical challenge, given the limited space for measurement positions, the large number of measurement positions, and the need for high measurement accuracy. Summary of the Invention

[0004] The purpose of this invention is to solve the problem of accurately measuring the position of the measuring point of the multi-stage guide vane channel of the low-pressure turbine of an aero-engine in a confined measuring space, so as to accurately control the precision of the multi-stage vane manufacturing process, thereby promptly identifying problems and adjusting the process equipment.

[0005] This invention is achieved through the following technical solution: a measuring device for detecting multi-blade channels, wherein the following are provided on the base: The positioning module includes N fixed positioning modules and one movable positioning module; the N fixed positioning modules and the one movable positioning module are arranged according to the 6-point positioning principle, wherein the N fixed positioning modules are arranged around the air intake side of the multi-stage plate, and the one movable positioning module is arranged separately on one side near the blade tip; The fixed positioning module includes a positioning seat, a positioning block, and a positioning pin. The positioning seat is fixedly connected to the base by fasteners. The positioning block is installed on a preset mounting position of the positioning seat by fasteners to achieve rigid fixation with the positioning seat. The positioning pin is inserted into a preset hole in the positioning block, with one end engaging with the positioning block and the other end directly contacting the lower edge of the multi-stage blade to form a fixed positioning point, thereby restricting the blade's degrees of freedom in the X and Y directions. The movable positioning module includes a support B and a movable positioning pin. The movable positioning pin is installed on the support B. The position of the movable positioning pin is adjusted by tightening the set screw to form a movable positioning point, thereby adjusting the blade's degree of freedom in the Z direction. The measurement module includes a reference block A, a reference block B, a measuring pin, a measuring block, and a section pin. Reference blocks A and B serve as measurement references and are fixedly mounted on the base using fasteners. The top surfaces of reference blocks A and B are reference surfaces and are parallel to the top surface of the positioning block in the positioning module. Reference blocks A and B are arranged parallel to each other along the multi-blade arrangement direction and are located on one side of the positioning module. The section pin is located between the reference blocks and the positioning module and is assembled on the base with an interference fit. Each section pin corresponds to a measuring block. For direct measurement, at the exhaust side, the measuring block is in contact with the reference block, and a feeler gauge is used to measure the gap between the measuring pin and the part being measured, thus determining the position of the measurement point. For indirect measurement, at the intake side, the measuring pin contacts the part being measured, and the tolerance value of the measurement point is determined by observing the gap between the measuring block and the reference block. The clamping module is used for quick mounting of multi-blade units.

[0006] Preferably, the spacing between reference block A and reference block B matches the number of blades in the multi-section blade.

[0007] Preferably, the measurement module further includes a stop block, which is attached to the side of the measurement block by fasteners to form a detection part. On the one hand, it serves as a limit, and on the other hand, it is used to detect the gap between the stop block and the reference block, so as to determine whether the detection point is qualified.

[0008] Preferably, the measurement module further includes a process ball head pin, which is fixed to the corner of the base by thread or interference fit. The top of its ball head serves as the self-calibration reference point of the device, maintaining a fixed distance from the reference surface of all reference blocks, and is used to periodically calibrate the positional accuracy of the measurement blocks and reference blocks.

[0009] Preferably, a hard alloy block is embedded in the top of the positioning block and the positioning seat respectively.

[0010] Preferably, the clamping module specifically includes a clamping support, an adjusting plate, a clamping screw, and a cylindrical pin. The clamping support is an L-shaped support structure and is connected to the base by fasteners. The adjusting plate directly contacts and clamps the multi-stage blades through the clamping screw. The adjusting plate is provided with a guide groove and can move up and down along the preset trajectory of the clamping support.

[0011] The beneficial effects of this invention are as follows: 1. This invention combines direct and indirect measurement, as well as a reasonable layout of positioning and measurement modules, to successfully achieve accurate detection of multi-blade channels in confined spaces, forming a mature process equipment that can be directly applied to production. It solves the problem that traditional measurement methods cannot be adapted to this type of blade structure, and the measurement process is convenient to operate without complex debugging, reducing the dependence on operator skills and adapting to the efficient detection of batch blades. 2. The positioning module adopts the 6-point positioning principle of "6 fixed points + 1 movable point". By adjusting the position of the movable positioning module, the tolerance of the positioning points of the inner and outer flow channels is made uniform, which effectively reduces the measurement error caused by uneven distribution of positioning tolerance. 3. The clamping module adopts a hinged lifting and quick clamping structure to achieve rapid fixing and disassembly of the blades. Compared with the traditional method of tightening bolts one by one, it greatly shortens the clamping time and improves the efficiency of part measurement. 4. Carbide blocks are embedded on the positioning blocks and positioning seats. Carbide has high wear resistance, which can greatly improve the wear resistance of the positioning components. Compared with traditional metal positioning blocks, it can effectively reduce dimensional loss during long-term use, extend the service life of the entire measuring device, reduce the maintenance cost of frequent replacement of positioning components, and adapt to long-term, high-frequency production and testing scenarios. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a three-dimensional model diagram of the low-pressure turbine multi-stage guide vane described in this invention; Figure 2 This is a three-dimensional model diagram of the measuring device according to an embodiment of the present invention; Figure 3 This is a three-dimensional model diagram of the positioning module in an embodiment of the present invention; Figure 4 This is a three-dimensional model diagram of the positioning block inlaid with cemented carbide according to an embodiment of the present invention; Figure 5 This is a three-dimensional model diagram of the measurement module (direct measurement) according to an embodiment of the present invention. Figure 6 This is a three-dimensional model diagram of the measurement module (indirect measurement) according to an embodiment of the present invention. Figure 7 This is a three-dimensional model diagram of the clamping module according to an embodiment of the present invention; Figure 8 This is a two-dimensional projection of the measuring device in an embodiment of the present invention. Figure 1 ; Figure 9 This is a two-dimensional projection of the measuring device in an embodiment of the present invention. Figure 2 ; Figure 10 This is a schematic diagram of the measurement device in use according to an embodiment of the present invention.

[0014] In the diagram, 1-base, 2-reference block B, 3-cylindrical pin A, 4-internal hexagonal head screw B, 5-section pin, 6-locating pin, 7-support A, 8-locating block D, 9-locating block C, 10-movable locating pin, 11-support B, 12-set screw, 13-reference block A, 14-locating block A, 15-process ball head pin, 16-clamping support A, 17-adjusting pressure plate B, 18-clamping screw, 19-cylindrical pin, 20-locating seat A, 21-locating pin A, 22-measuring pin A, 23-adjusting pressure plate A, 24-measuring block 1, 25-measuring block A, 26-stop, 27-cylindrical pin B, 28-internal hexagonal head screw B, 29-support leg, 30-measuring block 6. Detailed Implementation

[0015] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0016] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0017] The present invention will be further explained below using the detection of a five-blade channel as an example.

[0018] A measuring device for detecting a five-blade channel includes a positioning module, a measuring module, and a clamping module. Twenty measuring points are selected for measurement, including 10 measuring points on the exhaust side and 2 points on each of the five blades; 10 measuring points on the intake side and 2 points on each of the five blades.

[0019] The positioning module includes five fixed positioning modules and one movable positioning module, which together restrict the X, Y, and Z degrees of freedom of the multi-stage blades. The five fixed positioning modules and the one movable positioning module are arranged according to the six-point positioning principle. The five fixed positioning modules are arranged around the air intake edge of the multi-stage blades, and the one movable positioning module is arranged separately on one side near the blade tip.

[0020] The fixed positioning module includes a positioning seat, a positioning block, and a positioning pin. Hard alloy blocks are embedded in the top of the positioning block and the positioning seat respectively. The positioning seat is fixedly connected to the base 1 by fasteners. The positioning block is installed on a preset mounting position of the positioning seat by fasteners, achieving rigid fixation with the positioning seat. The positioning pin is inserted into a preset hole in the positioning block, with one end engaging with the positioning block and the other end directly contacting the lower edge of the multi-stage blade's intake to form a fixed positioning point, thereby restricting the blade's degrees of freedom in the X and Y directions.

[0021] In this embodiment, the positioning seat A is rigidly connected to the base via a hexagonal head screw B and a cylindrical pin A. The cylindrical pin A is used to position and limit the X and Y displacement of the positioning seat A, while the hexagonal head screw B is used to fasten and ensure that the positioning seat A is not loose after installation. The flatness error of the mounting surface is ≤0.01mm. Positioning blocks A14, C9, and D8 are respectively installed on the preset mounting positions of the positioning seat A20 using fasteners. The bottom surface of the positioning block is tightly fitted with the top surface of the positioning seat to achieve rigid fixation. At the same time, the hard alloy block embedded on the top of the positioning block needs to be fixed to the positioning block base by welding or interference fit to ensure that it will not fall off during long-term use. Six fixed positioning pins (including positioning pin A) are inserted into the preset holes of the positioning blocks respectively. Through transition fit, the positioning pins are ensured to be free from shaking. One end of the positioning pin extends out of the top surface of the positioning block by the same length, and the other end serves as a fixed positioning point, directly contacting the lower edge of the multi-blade air intake.

[0022] The movable positioning module includes a support B11 and a movable positioning pin 10. The movable positioning pin 10 is installed on the support B11. The position of the movable positioning pin 10 is adjusted by the set screw 12 to form a movable positioning point, thereby adjusting the degree of freedom of the blade in the Z direction.

[0023] The top surfaces of the six fixed positioning pins form an XY plane positioning reference, which contacts the preset positioning surface below the intake edge of the multi-blade, restricting the X and Y degrees of freedom of the blade; the top surfaces of the movable positioning pins contact the critical Z-axis position of the blade (usually the middle or end of the blade), and by adding shims for adjustment, the Z-axis positioning tolerance at both ends of the blade is made uniform, ultimately achieving complete constraint of the six-point positioning.

[0024] The measurement module includes a reference block A13, a reference block B2, a measuring pin, a measuring block, and a section pin 5. Reference blocks A13 and B2 serve as measurement references and are fixedly installed on the base 1 by fasteners. Reference blocks A13 and B2 are arranged parallel to each other along the multi-section blade arrangement direction and are located on one side of the positioning module. The spacing between reference blocks A13 and B2 matches the 5-section blade.

[0025] The reference block A13 serves as the reference surface for indirect measurement on the intake side, and is parallel to the top surface of the positioning block of the positioning module, providing a reference for judging the gap between the measuring block and the blade; the reference block B2 serves as the reference surface for direct measurement on the exhaust side, and is spaced from the reference block A13 to fit the 5-blade configuration, ensuring that the measurement covers all blades.

[0026] The cross-sectional pin is located between the reference block and the positioning module and is assembled on the base 1 with an interference fit. The cross-sectional pin corresponds one-to-one with the measuring block. The cross-sectional pin 5 serves as the positioning reference for the measuring block, restricts the lateral displacement of the measuring block, ensures that the measuring block is installed in the same position each time, and avoids measurement deviation.

[0027] The measurement module also includes a stop block 26, which is attached to the side of the measurement block by fasteners to form a detection part. On the one hand, it serves as a limit and on the other hand, it is used to detect the gap between the stop block and the reference block, so as to determine whether the detection point is qualified.

[0028] The measurement module also includes a process ball head pin 15, which is fixed to the corner of the base 1 by thread or interference fit. The top of its ball head serves as the self-calibration reference point of the device and maintains a fixed distance from the reference surface of all reference blocks. It is used to periodically calibrate the positional accuracy of the measurement blocks and reference blocks.

[0029] When performing direct measurements, the measuring block is placed against the reference block B2 at the exhaust edge to measure the gap between the measuring block and the measuring pin and the exhaust edge of the blade, thereby obtaining the measurement point data at the exhaust edge. At this time, the measuring pin is in a state where one end contacts the exhaust edge of the blade and the other end cooperates with the measuring block to form a gap measurement channel, which transmits the blade profile position information.

[0030] When performing indirect measurements, a measuring pin is used to contact the part being measured at the intake side. The tolerance value of the measuring point at the intake side is indirectly determined by observing the gap between the measuring block and the reference block A13. At this time, the measuring pin is in a state where one end is tightly attached to the intake side of the blade, and the other end pushes the measuring block closer to or further away from the reference block A13. The blade position is reflected by the change in the gap.

[0031] The clamping module, used for quickly clamping the multi-blade assembly, specifically includes a clamping support, an adjusting plate, clamping screws, and cylindrical pins. The clamping support is an L-shaped support structure connected to the base 1 via fasteners. The adjusting plate directly contacts and clamps the multi-blade assembly via the clamping screws. A guide groove is provided on the adjusting plate, allowing it to move up and down along a preset trajectory of the clamping support. In use, lifting the adjusting plate upwards along the guide groove releases the clamping device, providing strong clamping support for the measurement position.

[0032] The specific implementation process of this embodiment is as follows: S1. Preparation and inspection of measuring equipment: Move the measuring device to the horizontal measuring platform using the bottom support legs, ensuring that the base 1 is stable and does not wobble; the level of the base can be calibrated with the help of a level to avoid subsequent measurement errors caused by the tilt of the device; Inspect the integrity of each module component. For the positioning module, confirm that the 6 fixed positioning pins and 1 movable positioning pin are free from wear and deformation, the carbide blocks embedded on the top of positioning blocks A / C / D are not detached, and the set screws can be rotated flexibly. For the measurement module, check that the surface of the reference blocks A / B is free from scratches and the flatness error is ≤0.01mm; the measuring blocks 1-10 and AG are free from deformation, the feeler gauge scale is clear and without jamming; the cross-section pin and the guide groove of the measuring block fit smoothly. For the clamping module, verify that the adjusting pressure plate A / B can move up and down along the guide groove of the clamping support A, the clamping screws are not stripped, and ensure that the quick clamping function is normal. Using the process ball head pin 15 as the self-calibration reference of the device, check whether the distance tolerance between the reference surface of reference block A13 and reference block B2 and the center of the process ball head pin meets the requirements. At the same time, confirm the parallelism between the top surface of reference block A13 and reference block B2 and the top surface of the positioning block to ensure that the measurement reference is unified and accurate. S2, Five-blade positioning installation: (1) Based on the air intake edge profile of the five blades to be tested, manually fine-tune the corresponding measuring pin of the air intake edge, such as the position of measuring pin A22, to ensure that there is no interference when measuring pin A22 contacts the blade and can be accurately aligned with the measuring point of the air intake edge. (2) Place the five blades stably on the positioning seat A20, so that the lower part of the blade inlet edge is completely in contact with the six fixed positioning points of the positioning module (three restricting the X direction, two restricting the Y direction, and one restricting the Z direction), ensuring that the inlet edge of each of the five blade units is in close contact with the hard alloy block on top of the positioning block A / C / D, without any suspension or offset. (3) For one movable positioning pin 10 (Z-direction adjustment) of the positioning module, a shim with a thickness of 0.01-0.05mm is installed at the contact point between it and the five blades; the thickness of the shim is repeatedly adjusted until the thickness of the shim at both ends of the blade (the first and fifth blades) is consistent. At this time, the positioning point tolerance of the inner and outer flow channels of the blade is evenly distributed, effectively eliminating the positioning deviation caused by the deformation of the blade length direction. S3. Preparation and inspection of measuring equipment: (1) Hold the two ends of the adjusting pressure plate A / B with both hands and slowly lower it down along the guide groove of the pressing support A7 so that the lower surface of the adjusting pressure plate A / B gently touches the non-measuring area of ​​the five-blade joint (such as the connecting rib in the middle of the blade) to ensure that it does not block any measuring points on the air intake side or exhaust side, so as to avoid affecting subsequent testing. (2) Rotate the tightening screw clockwise to push the adjusting plate downward to apply pressure through the threaded transmission; the pressure control is based on the standard that the blade has no displacement and the surface has no indentation. The screw torque is controlled by the torque wrench to ensure that the five blades are always fixed in the same position during the measurement process, without loosening or slight displacement. S4. Precise measurement and recording by region: (1) Direct measurement: Move the corresponding measuring block (measuring block 1-10) along the guide groove of the cross section pin so that it fits tightly with the reference block B2; insert a feeler gauge into the gap between the measuring pin and the exhaust edge of the blade, read the actual gap value and record it; (2) Indirect measurement: Ensure that the measuring pin is in close contact with the air intake edge of the blade; insert a feeler gauge into the gap between the corresponding measuring block (measuring block AG) and the reference block A13, read the actual gap value and record it; S5. Blade disassembly and device resetting.

[0033] The above description is merely a specific embodiment of the present invention and should not be construed as limiting the scope of the invention. Therefore, any substitution of equivalent components or equivalent changes and modifications made within the scope of protection of this patent should still fall within the scope of this patent. Furthermore, the technical features, technical features and technical solutions, and technical solutions in this invention can be freely combined and used.

Claims

1. A measuring device for detecting multi-blade channels, characterized in that... The following are provided on the base (1): The positioning module includes N fixed positioning modules and one movable positioning module; the N fixed positioning modules and the one movable positioning module are arranged according to the 6-point positioning principle, wherein the N fixed positioning modules are arranged around the air intake side of the multi-stage plate, and the one movable positioning module is arranged separately on one side near the blade tip; The fixed positioning module includes a positioning seat, a positioning block, and a positioning pin. The positioning seat is fixedly connected to the base (1) by fasteners. The positioning block is installed on the preset mounting position of the positioning seat by fasteners to achieve rigid fixation with the positioning seat. The positioning pin is inserted into the preset hole of the positioning block. One end of the pin cooperates with the positioning block, and the other end directly contacts the lower part of the air intake edge of the multi-stage blade to form a fixed positioning point, so as to restrict the degree of freedom of the blade in the X and Y directions. The active positioning module includes a support B (11) and an active positioning pin (10). The active positioning pin (10) is installed on the support B (11). The position of the active positioning pin (10) is adjusted by the set screw to form an active positioning point, thereby adjusting the degree of freedom of the blade in the Z direction. The measurement module includes a reference block A, a reference block B, a measuring pin, a measuring block, and a cross-sectional pin. Reference block A and reference block B serve as measurement references and are fixedly installed on the base (1) by fasteners. The top surfaces of reference block A and reference block B are reference surfaces and are parallel to the top surfaces of the positioning blocks in the positioning module. Reference block A and reference block B are arranged parallel to each other along the multi-blade arrangement direction and are located on one side of the positioning module. The cross-sectional pin is located between the reference block and the positioning module and is assembled on the base (1) with an interference fit. The cross-sectional pin corresponds one-to-one with the measuring block. When performing direct measurement, the measuring block and the reference block are in contact at the exhaust side, and the gap between the measuring pin and the measured part is measured using a feeler gauge to measure the position of the measuring point. When performing indirect measurement, the measuring pin is in contact with the measured part at the intake side, and the tolerance value of the measuring point is determined by observing the gap between the measuring block and the reference block. The clamping module is used for quick mounting of multi-blade units.

2. The measuring device for detecting multi-blade channels according to claim 1, characterized in that: The spacing between reference block A and reference block B is matched to the number of blades in the multi-section blade.

3. The measuring device for detecting multi-blade channels according to claim 1, characterized in that: The measurement module also includes a stop block, which is attached to the side of the measurement block by fasteners to form a detection part. On the one hand, it serves as a limit, and on the other hand, it is used to detect the gap between the stop block and the reference block, so as to determine whether the detection point is qualified.

4. The measuring device for detecting multi-blade channels according to claim 1, characterized in that: The measurement module also includes a process ball head pin, which is fixed to the corner of the base (1) by thread or interference fit. The top of its ball head serves as the self-calibration reference point of the device and maintains a fixed distance from the reference surface of all reference blocks. It is used to periodically calibrate the position accuracy of the measurement block and the reference block.

5. The measuring device for detecting multi-blade channels according to claim 1, characterized in that: Hard alloy blocks are embedded on the top of the positioning block and the positioning seat, respectively.

6. The measuring device for detecting multi-blade channels according to claim 1, characterized in that: The specific structure of the clamping module includes a clamping support, an adjusting plate, a clamping screw, and a cylindrical pin. The clamping support is an L-shaped support structure and is connected to the base (1) by fasteners. The adjusting plate directly contacts and clamps the multi-blade by clamping screw. A guide groove is provided on the adjusting plate, which can move up and down along the preset trajectory of the clamping support.

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